BRIAN WILLIAMS: Good evening. As a lot of American adults not so fondly remember, the last time the government was found looking into the phone calls of reporters and using the IRS for political purposes, it was the Nixon era, and while times have changed and circumstances are different, that subject came up at the Obama White House today as the administration now scrambles on several fronts. We begin with the potentially illegal use of the IRS to scrutinize some American groups and citizens because of their politics, and in this case because of conservative politics. Again, this is just one front we're covering tonight.